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- /*
- * Copyright (C) 2009, Robin Rosenberg
- * Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.lib;
-
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.List;
-
- import org.eclipse.jgit.util.IO;
- import org.eclipse.jgit.util.RawParseUtils;
-
- /**
- * Utility for reading reflog entries
- */
- public class ReflogReader {
- /**
- * Parsed reflog entry
- */
- static public class Entry {
- private ObjectId oldId;
-
- private ObjectId newId;
-
- private PersonIdent who;
-
- private String comment;
-
- Entry(byte[] raw, int pos) {
- oldId = ObjectId.fromString(raw, pos);
- pos += Constants.OBJECT_ID_STRING_LENGTH;
- if (raw[pos++] != ' ')
- throw new IllegalArgumentException(
- "Raw log message does not parse as log entry");
- newId = ObjectId.fromString(raw, pos);
- pos += Constants.OBJECT_ID_STRING_LENGTH;
- if (raw[pos++] != ' ') {
- throw new IllegalArgumentException(
- "Raw log message does not parse as log entry");
- }
- who = RawParseUtils.parsePersonIdentOnly(raw, pos);
- int p0 = RawParseUtils.next(raw, pos, '\t'); // personident has no
- // \t
- if (p0 == -1) {
- throw new IllegalArgumentException(
- "Raw log message does not parse as log entry");
- }
- int p1 = RawParseUtils.nextLF(raw, p0);
- if (p1 == -1) {
- throw new IllegalArgumentException(
- "Raw log message does not parse as log entry");
- }
- comment = RawParseUtils.decode(raw, p0, p1 - 1);
- }
-
- /**
- * @return the commit id before the change
- */
- public ObjectId getOldId() {
- return oldId;
- }
-
- /**
- * @return the commit id after the change
- */
- public ObjectId getNewId() {
- return newId;
- }
-
- /**
- * @return user performin the change
- */
- public PersonIdent getWho() {
- return who;
- }
-
- /**
- * @return textual description of the change
- */
- public String getComment() {
- return comment;
- }
-
- @Override
- public String toString() {
- return "Entry[" + oldId.name() + ", " + newId.name() + ", " + getWho() + ", "
- + getComment() + "]";
- }
- }
-
- private File logName;
-
- ReflogReader(Repository db, String refname) {
- logName = new File(db.getDirectory(), "logs/" + refname);
- }
-
- /**
- * Get the last entry in the reflog
- *
- * @return the latest reflog entry, or null if no log
- * @throws IOException
- */
- public Entry getLastEntry() throws IOException {
- List<Entry> entries = getReverseEntries(1);
- return entries.size() > 0 ? entries.get(0) : null;
- }
-
- /**
- * @return all reflog entries in reverse order
- * @throws IOException
- */
- public List<Entry> getReverseEntries() throws IOException {
- return getReverseEntries(Integer.MAX_VALUE);
- }
-
- /**
- * @param max
- * max numer of entries to read
- * @return all reflog entries in reverse order
- * @throws IOException
- */
- public List<Entry> getReverseEntries(int max) throws IOException {
- final byte[] log;
- try {
- log = IO.readFully(logName);
- } catch (FileNotFoundException e) {
- return Collections.emptyList();
- }
-
- int rs = RawParseUtils.prevLF(log, log.length);
- List<Entry> ret = new ArrayList<Entry>();
- while (rs >= 0 && max-- > 0) {
- rs = RawParseUtils.prevLF(log, rs);
- Entry entry = new Entry(log, rs < 0 ? 0 : rs + 2);
- ret.add(entry);
- }
- return ret;
- }
- }
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